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# This is a wrapper around Token Bucket Filter (TBF) queue discipline
#
#
# **** License ****
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# This code was originally developed by Vyatta, Inc.
# Portions created by Vyatta are Copyright (C) 2008 Vyatta, Inc.
# All Rights Reserved.
# **** End License ****
package Vyatta::Qos::RateLimiter;
use strict;
use warnings;
use VyattaConfig;
use Vyatta::Qos::Util qw/getRate getTime/;
my %fields = (
_rate => undef,
_burst => undef,
_latency => undef,
);
sub new {
my ( $that, $config ) = @_;
my $level = $config->setLevel();
my $class = ref($that) || $that;
my $self = {%fields};
$self->{_rate} = getRate($config->returnValue("bandwidth"));
defined $self->{_rate} or die "$level bandwidth not defined\n";
$self->{_burst} = $config->returnValue("burst");
defined $self->{_burst} or die "$level burst not defined\n";
$self->{_latency} = getTime($config->returnValue("latency"));
defined $self->{_latency} or die "$level latency not defined\n";
return bless $self, $class;
}
sub commands {
my ( $self, $out, $dev ) = @_;
printf {$out} "qdisc add dev %s root tbf rate %s latency %s burst %s\n",
$dev, $self->{_rate}, $self->{_latency}, $self->{_burst};
}
sub isChanged {
my ($self, $name) = @_;
my $config = new VyattaConfig;
$config->setLevel("qos-policy rate-limit $name");
foreach my $attr ('bandwidth', 'burst', 'latency') {
if ($config->isChanged($attr)) {
return $attr
}
}
return undef; # false
}
1;
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